Source : Webster's Revised Unabridged Dictionary (1913)

Merl \Merl\, Merle \Merle\, n. [F. merle, L. merula, merulus.
   Cf. {Ousel}.] (Zo["o]l.)
   The European blackbird. See {Blackbird}. --Drayton.

Source : WordNet®

merle
     n : common black European thrush [syn: {blackbird}, {merl}, {ouzel},
          {ousel}, {European blackbird}, {Turdus merula}]